Electronic wavelength marker system and method
First Claim
1. A system for producing wavelength tunable laser light and a signal indicative of the wavelength of the produced laser light comprising:
- a laser cavity including an optical gain medium and a wavelength selective element disposed in a path of light emitted by the optical gain medium such that changing a position of the element changes a wavelength emitted by the medium;
a position sensor that senses position of the element;
position signal circuitry that produces a position signal indicative of position of the element sensed by the position sensor;
a storage medium storing at least one position signal corresponding to a respective predetermined position of the element;
comparison circuitry for comparing the produced position signal with the at least one stored position signal and for producing a comparison result indicative of whether the element has reached to the predetermined position;
marker signal circuitry providing an external wavelength marker signal when the comparison result indicates that the element has reached the respective predetermined position.
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Accused Products
Abstract
A system is provided for producing wavelength tunable laser light and a signal indicative of the wavelength of the produced laser light; a laser cavity includes an optical gain medium and a wavelength selective element disposed in a path of light emitted by the optical gain medium such that changing a position of the element changes a wavelength emitted by the medium; a position sensor that senses position of the element; position signal circuitry that produces a position signal indicative of position of the element sensed by the position sensor; a storage medium storing at least one position signal corresponding to a respective predetermined position of the element; comparison circuitry for comparing the produced position signal with the at least one stored position signal and for producing a comparison result indicative of whether the element has reached to the predetermined position; marker signal circuitry providing an external wavelength marker signal when the comparison result indicates that the element has reached the respective predetermined position.
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Citations
21 Claims
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1. A system for producing wavelength tunable laser light and a signal indicative of the wavelength of the produced laser light comprising:
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a laser cavity including an optical gain medium and a wavelength selective element disposed in a path of light emitted by the optical gain medium such that changing a position of the element changes a wavelength emitted by the medium;
a position sensor that senses position of the element;
position signal circuitry that produces a position signal indicative of position of the element sensed by the position sensor;
a storage medium storing at least one position signal corresponding to a respective predetermined position of the element;
comparison circuitry for comparing the produced position signal with the at least one stored position signal and for producing a comparison result indicative of whether the element has reached to the predetermined position;
marker signal circuitry providing an external wavelength marker signal when the comparison result indicates that the element has reached the respective predetermined position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for producing wavelength tunable laser light and a signal indicative of the wavelength of the produced laser light comprising:
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a laser cavity including an optical gain medium and a wavelength selective element disposed in a path of light emitted by the optical gain medium such that changing a position of the element changes a wavelength emitted by the medium;
an actuator for changing position of the wavelength selective element;
a position sensor that senses position of the element;
position signal circuitry that produces a digital position signal indicative of position of the element sensed by the position sensor;
a storage medium that includes a RAM that stores multiple predetermined position signals each comprising a different digital value corresponding to a different predetermined position of the element;
a processor that is coupled to provide control signals to the actuator so as to control changing of position of the wavelength selective element by the actuator and that is coupled to receive as feedback the produced position signals indicative of position of the element sensed by the position sensor and that is coupled to provide to the storage medium the multiple predetermined position signals and that provides a RAM address information signal;
comparison circuitry for comparing the produced digital position signal with a selected stored digital position signal and for producing a comparison result indicative of whether the element has reached a predetermined position that corresponds to a previously selected predetermined position signal;
selection circuitry that is coupled to receive the RAM address information signal from the processor and that is coupled to receive the comparison result and that is coupled to provide a to the RAM an address signal that selects a next stored position signal from among the multiple stored position signals when the comparison result indicates that the element has reached a predetermined position that corresponds to a previously selected stored predetermined position signal; and
marker signal circuitry providing an external wavelength marker signal when the comparison result indicates that the element has reached the respective predetermined position. - View Dependent Claims (16)
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17. A system for producing wavelength tunable laser light and a signal indicative of the wavelength of the produced laser light comprising:
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a laser cavity including an optical gain medium and a wavelength selective element disposed in a path of light emitted by the optical gain medium such that changing a position of the element changes a wavelength emitted by the medium;
an actuator for changing position of the wavelength selective element;
a position sensor that senses position of the element, wherein the position sensor includes, a reticle that changes position with the element such that position of the reticle is indicative of position of the element;
a light source disposed on one side of the reticle;
a light detector that is disposed on an opposite side of the reticle and that produces a light detector signal indicative of changes in light passing through the reticle with changes in positions of the reticle and the element;
position signal circuitry that produces a position signal indicative of position of the element sensed by the position sensor, wherein the position signal circuitry includes, an encoder responsive to the light detector signal that produces quadrature signals indicative of position of the element; and
interpolator circuitry that converts the produced quadrature signals to a digital count value that represents position of the element; and
a storage medium that includes a RAM that stores multiple predetermined position signals each comprising a different digital value corresponding to a different predetermined position of the element;
a processor that is coupled to provide control signals to the actuator so as to control changing of position of the wavelength selective element by the actuator and that is coupled to receive as feedback the produced position signals indicative of position of the element sensed by the position sensor and that is coupled to provide to the storage medium the multiple predetermined position signals and that provides a RAM address information signal;
comparison circuitry for comparing the produced digital position signal with a selected stored digital position signal and for producing a comparison result indicative of whether the element has reached a predetermined position that corresponds to a previously selected predetermined position signal;
selection circuitry that is coupled to receive the RAM address information signal from the processor and that is coupled to receive the comparison result and that is coupled to provide a to the RAM an address signal that selects a next stored position signal from among the multiple stored position signals when the comparison result indicates that the element has reached a predetermined position that corresponds to a previously selected stored predetermined position signal; and
marker signal circuitry providing an external wavelength signal when the comparison result indicates that the element has reached the respective predetermined position.
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18. A system for producing wavelength tunable laser light and a signal indicative of the wavelength of the produced laser light comprising:
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a laser cavity including an optical gain medium and a wavelength selective element disposed in a path of light emitted by the optical gain medium such that changing a position of the element changes a wavelength emitted by the medium;
means for changing position of the wavelength selective element;
means for sensing position of the element;
means for producing a position signal indicative of position of the element sensed by the position sensor;
means for storing at least one position signal corresponding to a respective predetermined position of the element;
comparison means for comparing the produced position signal with the at least one stored position signal and for producing a comparison result indicative of whether the element has reached to the predetermined position; and
means for providing an external wavelength marker signal when the comparison result indicates that the element has reached the respective predetermined position.
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19. A method of determining wavelength of a light produced by a wavelength tunable laser system that includes a laser cavity including an optical gain medium and a wavelength selective element disposed in a path of light emitted by the optical gain medium such that changing a position of the element changes a wavelength emitted by the medium, the method comprising:
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(A) storing in a storage medium a plurality of predetermined position signals each corresponding to a different predetermined position of the element;
(B) selecting a predetermined stored position signal that corresponds to a next predetermined position;
(C) changing the position of the element so as to change the wavelength of light emitted by the laser system;
(D) sensing position of the element as the element changes position;
(E) producing a position signal indicative of the sensed position of the element;
(F) comparing the produced position signal with the selected stored predetermined position signal;
(G) producing an external marker signal indicative of the wavelength of light emitted by the laser system when the comparison indicates that the element has reached a respective predetermined position that corresponds to the selected predetermined position signal. - View Dependent Claims (20, 21)
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Specification